2145658 has 4 divisors (see below), whose sum is σ = 3218490. Its totient is φ = 1072828.

The previous prime is 2145643. The next prime is 2145677. The reversal of 2145658 is 8565412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1940449 + 205209 = 1393^2 + 453^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536413 + ... + 536416.

2^2145658 is an apocalyptic number.

2145658 is a deficient number, since it is larger than the sum of its proper divisors (1072832).

2145658 is a wasteful number, since it uses less digits than its factorization.

2145658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072831.

The product of its digits is 9600, while the sum is 31.

The square root of 2145658 is about 1464.8064718590. The cubic root of 2145658 is about 128.9793448892.

The spelling of 2145658 in words is "two million, one hundred forty-five thousand, six hundred fifty-eight".